Grinding machine



July 1, 1930- s. KosKiNEN 1,769,143'

GRINDING MACHINE Filed March 28, 1928 NVENTOR. 015m? Hoskz'nen,

Patented Julyll, 1930 PAT/ENT OFFICE- .oNNI s. KosKlNnN, orj'irnrnorr;iivrrcnrefiiv` GBINDING MACHINE Application led March 28, `1928. Serial No` 265,315. i

' Myinvention'relates to a new andl useful f improvement in a grinding machineadapted j ture and highly eficientin use.

for grinding dies, punches, etc; j

It is anobject of the present invention to provide a machine of this class which willbe simple in structure, economical of'manufac In grinding'the dies it is my intention to use a guide surface from which the grinding surface of the grinding wheel will be guidedand the present invention is to provide a grinding machine having a guide lmember piounted thereon for engaging the guide sur- In carrying out this method of grinding it is desirable that` the* contacting member which engages the guiding surface shall not bel of the same diametery as/the grinding wheel, and it is an object "of the present inventionto provide a dressing tool and' means for holding and adjusting thesame so that the periphery of the contactingv memberfmay be ground to a size bearing a relation tothe diameter of the grinding wheel. i

Other objects' will appear hereinafter." e The invention consists in the combination and arrangement l'of partshereinafter de'-v scribed and claimed. fr

The invention will be best understood by a reference to the accompanying 'drawings which form a part of this specication, and in which,

, Fig. 1 is a side elevational `view of the vention. l u

Fig 2 is a view taken on line 2-2 of Fig. 1'.

Fig. 3 is a sectional view taken on `line 3-3 of Fig. 2.

Fig. 4 is a fragmentary view taken" on line 4--4ofFig.'3.

Fig. 5 is a view taken on line 5-5 of Fig; 3.

In the drawings I have illustratedthe inf vention used with a supportingstandard 9 upon which is slidably mounted thebed' 10 carrying the housing 11l upon which the work vretainer 13 is positioned,- shielded bythe v .guard member 12, the workpiece 14fbeing y `held by the retaining member 13 in a wellknown manner. Mounted upon :the upper end of the standard 9 is a bracket 15, positioned yabove which is a cage 16 of an electrical moy50 tor 17. The shaft 18 of the motor is iiXedly attached tothe pulley 19 which is connected bythe ,belt 20, enclosed by the belt guard 21, to the pulley 22 which is iixedly mounted upon the shaft 23, this shaft projecting into 55 a passageway 24" formed in the housing 24.`

A thrust bearing 24 engages the shaft 23, adjacent one end of the passage 24', and a sleeve '25 is threadedinto the lower end of the passageand serves as afbearing for the o tapered end ofthe shaft, this sleeve 25 having oil passages 26 formed therein. Threaded on the lower end of the sleeve 25 is a collar 27 having the inwardly projecting yflange 28 adapted to overlap so as to engage ,65

the undersurface of the flange 29 which projects outwardly from the upper end ofthe collar 30. Mounted on the lower end of the collar 30 is a guide contact ring 31. A

grinding `wheel 32 is iixedly mounted on the 7,0 y

lower endl of theshaft 23. Threaded into ythe collarl 30 `is a setscrew 33 whereby this collar, may be caused to rotate in unison with Y the `shaft `23. When it isdesired that the collar 30gremain stationary, relatively to the 75 shaft-23, while thesafme is rotating, the set -screw 33 will be. removed and the collar 27 threaded' onto the member 25 so as to clamp theupper end of the collar 30 in engagement with the lower end of the me1nber'25.

` It is of courseevident that when it is de,- sired to have the collar 30 rotate with the shaft 23, the set screw 33 will'be used and the collarv 27 unscrewed lslightly to permit the necessary play ofthe flange -29 so that a free 85 Vand easy rotation relatively to the collar 27 may be effected. y v

Iounted onthe housing 24 isa housinor 34 in which is slidably mounted a square `shaft 35 to which is attached a nut 36 in whichis gq threaded the stem 37, this stem being supported by and journalled in the upper end 38 of the housing. A bevel gear 39 is tixedly mounted on the stem 37 and adapted to mesh with the bevel gear 40 lixedly mounted upon the shaft 41, upon which is iXedly mounted the hand wheel 42 to eiect a rotation ot the gear 40 and the stem y37 so as toV raise and lower the member 35 in the housing 34. The lower end 43 or" this member 35 is Areduced and projects through the plate 44. Formed on the lower end of the portion 43 is areduced'head 45 upon which is swivelly mounted a housing 46, this housing being clamped on the head by a bolt projected through the 47. Slidably mounted in the split portion housing 46 is a barrel 48 in which isthreaded the set screw 49 adapted to engage the diamond dressing tool 50 which is inserted lin the barrel 48, Threaded through the end of the housing 46 is a screw 51 having a knurled head 52 formed thereon, this screw being lswivelly connected tothe barrel 48 so that a threading ot the screw 51 will effect an axial movement of the barrel 48 rrelatively to the f housing 46 so that the dressing tool may be moved toward and withdrawn from the periphery of the grinding wheel 32. By raising and lowering this dressing toolwhile `the grinding wheel is rotating, it is evidentY ythat adressing of the'grinding wheel may be elected. v f f Mounted on the housing 24 is a housing 53 in vwhich is slidably mounted the shaft 54 having a reduced port-ion 55 projecting outwardly from the housing through the plate 56. Swingably mounted on' the 'head 57 formed onthe reduced portion 55 and adapted to be Vclamped thereon at will is a housing 58 in which is slidably mounted the tool retaining barrel 59 in which is threaded the set screw 60 tor engaging the guide dressing tool 61. A stein 62, resembling the lstem 51, is swivelly connected to the barrel 59 and projected exteriorly of the housing and provided with a knurled head 63 which is yprovided on one face 64'with graduations corresponding to the graduations on the periphery of the housing 58. "Secured tothe member 54, ad- .'acent the upper end, is a nut 65 in which threads the stem 66 which is depended from and journalled in the top 67 ot the housing 53. y A bevel gear 68 is fixedly mounted on the stem 6,6 meshing with a bevel gear 69 mountedffixedly on the shaft 70 on which is lixedly mounted the hand wheel 71.

By a rotation of the hand wheel 71, the

dressing tool 61 may be moved axially of the grindingwheel 32 and guiding ring 31. 1 As shown in Fig. 4,`the housing 34 is rockingly mounted by means of the screw 72 on the housing'24, so that the diamond 50 may be inclined to the diameter of the grinding-whee 32-totaper the grinding wheel; 1 x

A screw 73 is provided with a head 74 which engages in a recess 75 -formed in the housing 34 and is provided with a nut 76 whereby the housing may be locked in its various positions of tilt.

As shown in Fig. 2, the housing 53 is secured by suitable screws 77 in iXed relation to the housing 24.

In operation the diamond 50 may be adjusted to the desired position and moved axially of the housing 34 'for dressing the grinding tool 32.

When it' is desired to use the grinding `wheel 32 for grinding the workpiece 14 the contact guide ring 31 is brought into engagement'with a guide strip 78 which is Xedly mounted ,upon the upper surface of the workpiece 14 so as to have one face projecting outwardly beyond .the face of the workpiece to be ground, or positioned inwardly from it, as desired. l l v t 'i The contact guide ring 31 engages this guide surface and serves to guide the grinding wheel 32 relatively to the workpiece 14.

The distance of displacement between the guide surface and the lsurface of the workpieceto be ground will in all cases be known, and consequentlyafter the grinding wheel has been ground, the guide ring may be faced and dressed to the proper diameter. In order todo thisthe dressing tool 61 is brought into engagement with the periphery of the grinding wheel 32, after the grinding wheel has been dressed, The guide dressing tool 61 is then moved upwardly so as to engage inthe space betweenth'e upper face of the grinding wheeland the contact guide ring, shown in Fig. 3. The nut 63 may then be turned, using the graduations as a guide, soas to project the dressing tool 61 inwardly, or with- `draw it, as the caser may be, a distance corresponding to the distance of displacement of the relative surfaces. Vhen this has been done, the dressing operation on the contact guide ring may then be e'ected so that when 'the grindingoperation is accomplished with the contact guide ring in engagement with the guide strip7 8, the'face of the workpiece 14will be of the contour and dimensions de- Sired- The barrel 48 is prevented from rotating in the housing 46 by Vmeans of the block 79 which engages the flat 8O formed on the periphery of the barrel. A similar block 81 engages asimilar flat formed on the barrel 59.

It is thus seen that I have provided a mechanismwhereby the contact guide ring may be dressed in proportion to the size of the grinding wheel and also whereby the grindingwheelmay be dressed to a ktapered or cylindrical shape. v

VhileI have illustrated and described the preferred form of my invention, I do not wish' to limit myself tothe precise details of structure shown, but desire topavail myself of such variations and modifications as come within the scope of the 'appended claims.

Having thus described my invention, what I claim as new and desire to secureby Letters Patent is:

1. A grinding machine of the class described, comprising: a grinding member; a guide contact member; a dressing tool-fcr dressing the periphery ofsaid guide Vcontact member; and means for adjusting the position o-f said tool in cc-ordination to *the'periphery of said grinding` member.

2. In a grinding machine of the class `described, a grinding wheel; a guide contact member; a tool carryingmember; a tool mounted in said tool carrying member for dressing the periphery of said guide contact member; and means for adjusting the position of said tool carrying member relatively to the periphery of said grinding wheel for determining a predetermined relative klocation of the peripheries of said guide contact member and said grinding wheel.

3. In a grinding machine of the class described, a grinding wheel; aguide contact member; means for securing said guide con- ONN I S.- KOSKINEN.

tact member to rotate in unison with said grinding wheel; and means for retaining said guide contact member non-rotatable upon rotation of said grinding wheel.

4. In a grinding machine of the class described, a grinding member; a guide contact member arranged concentrically of said grinding member; means for dressing the periphery of said guide contact member; and means for adjusting the position of said dressing means in co-ordination to the pe-y riphery of said grinding member.

5. In a grinding machine` oftheclass described, a shaft; a grinding wheelmounted 'on said shaft and rotatable` therewith; a

bearing for said shaft having a threaded periphery and normally stationary upon rotation of said shaft; a vcollar mounted on said shaft and movable axially thereof and rotatable thereon; a guide Contact member mounted fixedly on said collar; means for locking said collar on Vsaid shaft for rotation in uni so-n therewith. c

6. In a grinding machine of the class'de scribed, a shaft; a grinding wheel mounted on said shaft and rotatable therewith; a bearing for said shaft having a threaded periphery and normally stationary upon rotation of said shaft; a collar mounted on said shaft and movable axially thereof and rotatable thereon; a guide contact member mounted iiXedly on said collar; means for locking said collar on said shaft. for rotation in unison therewith; and means upon release of said locking means for moving said collar axially of said shaft and locking'A the same Vagainst rotation thereon.

7. In a grinding machine of the class de- 

